我需要创建一个活动，该活动必须在下周通过。活动是使用2个按钮（“相机”和“地图”）制作一个主页，这意味着我必须使用意图功能来运行此App。但是我有一个问题，“相机”按钮可以正常工作，但是我的地图无法正常工作，这就是为什么我在这里寻求帮助的原因。
我尝试过地图=
(Button) findViewById(R.id.map);
map.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v)
{ openMapsActivity();
}
});
然后
p
ublic void openMapsActivity() {
Intent intent = new Intent(this, MapsActivity.class);
startActivity(intent);
}
但似乎不起作用
这是我主要活动的代码： 包com.example.midexam;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.Camera;
import android.net.Uri;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Map;
public class MainActivity extends AppCompatActivity {
private static final int CAMERA_PICUTRE = 1;
private static final String IMAGE_RESOURCE = "strKeyimage";
ImageView imgPic;
Button btnCamera, map;
Bitmap photo;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnCamera = (Button) findViewById(R.id.btnCamera);
btnCamera.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent cameraIntent = new Intent (MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(cameraIntent, CAMERA_PICUTRE);
}
});
map = (Button) findViewById(R.id.map);
map.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v)
{ openMapsActivity();
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == CAMERA_PICUTRE && resultCode == RESULT_OK){
Uri selectedUriImage = data.getData();
try {
photo = MediaStore.Images.Media.getBitmap(this.getContentResolver(),
selectedUriImage);
}
catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e ) {
e.printStackTrace();
}
imgPic.setImageBitmap(photo);
}
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putParcelable(IMAGE_RESOURCE, photo);
}
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
photo = savedInstanceState.getParcelable(IMAGE_RESOURCE);
imgPic.setImageBitmap(photo);
}
public void openMapsActivity() {
Intent intent = new Intent(this, MapsActivity.class);
startActivity(intent);
}
}
Code for my MapActivity:
package com.example.midexam;
import android.Manifest;
import android.content.Context;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.graphics.Color;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.support.v4.app.ActivityCompat;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.CameraPosition;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.android.gms.maps.model.PolylineOptions;
public class MapsActivity extends AppCompatActivity implements OnMapReadyCallback, LocationListener {
private GoogleMap mMap;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
LatLng central = new LatLng(8.404278, 124.290969);
mMap.addMarker(new MarkerOptions()
.position(central)
.title("Your Here")
.icon(BitmapDescriptorFactory.fromResource(R.drawable.rsz_black)
)
);
LatLng anthony = new LatLng(8.404407, 124.286771);
mMap.addMarker(new MarkerOptions()
.position(anthony)
.title("You arrive")
.icon(BitmapDescriptorFactory.fromResource(R.drawable.rsz_black)
)
);
mMap.addPolyline(new PolylineOptions() .add(
central,
new LatLng(8.404448, 124.290791),
new LatLng(8.404575, 124.290651),
new LatLng(8.404873, 124.287250),
new LatLng(8.404358, 124.287154),
anthony
)
.width(10)
.color(Color.GREEN)
);
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED)
//TODO: Consider calling
return;
;
//add permission check
mMap.setMyLocationEnabled(true);
LocationManager lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
Location myLocation = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (myLocation != null) {
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_COARSE);
String provider = lm.getBestProvider(criteria, true);
myLocation = lm.getLastKnownLocation(provider);
CameraPosition cameraPosition2 = new CameraPosition.Builder()
.target(new LatLng(myLocation.getLatitude(), myLocation.getLongitude()))
.zoom(17)
.bearing(90)
.tilt(40)
.build();
mMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition2));
}
}
@Override
public void onLocationChanged(Location location) {
double latitude = location.getLatitude();
double longitude = location.getLongitude();
LatLng latLng = new LatLng(latitude, longitude);
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
mMap.animateCamera(CameraUpdateFactory.zoomTo(15));
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider){
}
}
my manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.midexam">
<!--
The ACCESS_COARSE/FINE_LOCATION permissions are not required to use
Google Maps Android API v2, but you must specify either coarse or fine
location permissions for the 'MyLocation' functionality.
-->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.CAMERA" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<!--
The API key for Google Maps-based APIs is defined as a string resource.
(See the file "res/values/google_maps_api.xml").
Note that the API key is linked to the encryption key used to sign the APK.
You need a different API key for each encryption key, including the release key that is used to
sign the APK for publishing.
You can define the keys for the debug and release targets in src/debug/ and src/release/.
-->
<meta-data
android:name="com.google.android.geo.API_KEY"
android:value="@string/google_maps_key" />
<activity
android:name=".MainActivity"
android:label="@string/title_activity_maps">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
then my activity_map XML File;
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:map="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/map"
android:name="com.google.android.gms.maps.SupportMapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MapsActivity"
/>
and the Last activity_main.xml file:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.midexam.MainActivity"
>
<ImageView
android:id="@+id/imgPic"
android:layout_width="200dp"
android:layout_height="200dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="78dp"
android:scaleType="centerCrop"
android:src="@mipmap/ic_launcher"/>
<Button
android:id="@+id/btnCamera"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/imgPic"
android:layout_below="@+id/imgPic"
android:layout_marginTop="22dp"
android:text="Camera"/>
<Button
android:id="@+id/map"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/btnCamera"
android:layout_alignBottom="@+id/btnCamera"
android:layout_alignRight="@+id/imgPic"
android:text="map"/>
</RelativeLayout>
I expected the Intent function I tried for the map activity will work out but I was wrong.
答案 0 :(得分：0)
像这样更新清单应用程序：
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<!--
The API key for Google Maps-based APIs is defined as a string resource.
(See the file "res/values/google_maps_api.xml").
Note that the API key is linked to the encryption key used to sign the APK.
You need a different API key for each encryption key, including the release key that is used to
sign the APK for publishing.
You can define the keys for the debug and release targets in src/debug/ and src/release/.
-->
<meta-data
android:name="com.google.android.geo.API_KEY"
android:value="@string/google_maps_key" />
<activity
android:name=".MainActivity"
android:label="@string/title_activity_maps">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".MapsActivity"
android:screenOrientation="portrait" />
</application>